Errata (Japanese: エラッタ Eratta) are changes to any part of the text of a card (other than Card Number) that occur between reprints.
Errata can be made to a card for a variety of reasons, including to fix mistakes, to update a card's terminology, or to clarify the behavior of a card so that its rulings are easier to understand (such as Problem-Solving Card Text). Some errata specifically modify the card's functionality itself, usually as a way to make the card less powerful in order to remove it from the Forbidden list.
Players are not required to own the most recent erratum of a card, but they must always be played according to the latest erratum even if using an older copy of the card. Konami recommends using the most recent printing of a card, because that text is the most accurate.
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with its own effect or with "Rise of the Snake Deity". This card gains 500 ATK for each Reptile-Type monster in your Graveyard. This card cannot be targeted and is unaffected by the effects of other Monsters, Spells, and Traps. When this card is destroyed by battle and sent to the Graveyard, you can remove from play 1 other Reptile-Type monster from your Graveyard to Special Summon this card. When this card inflicts Battle Damage to your opponent, place 1 Hyper-Venom Counter on it. When 3 Hyper-Venom Counters are on this card, you win the Duel.
Cannot be Normal Summoned or Set. be Special Summoned with "Rise of the Snake Deity" . This card gains 500 ATK for each Reptile-Type monster in your Graveyard. This card cannot be targeted and is unaffected by. When this card is destroyed by battle and sent to the Graveyard You can 1 other Reptile-Type monster from your Graveyard Special Summon this card. When this card inflicts Battle Damage to your opponent Place 1 Hyper-Venom Counter on it. When 3 Hyper-Venom Counters are on this card, you win the Duel.
Major mechanical changes
Beginning in March 2014, cards can receive errata that make major mechanical changes to their effects, rather than simply having errors or consistency corrected. The vast majority of these are to cards that are Forbidden at the time of the erratum, weakening the cards enough so that they no longer need to be Forbidden.
Tribute 1 DARK monster with 1000 or less ATK. Check all monsters on your opponent's side of the field, your opponent's hand, and all cards they draw (until the end of your opponent's 3rd turn after this card's activation), and destroy all monsters with 1500 or more ATK.
Tribute 1 DARK monster with 1000 or less ATK; also you look at your opponent's hand and all monsters they control, and if you do, destroy the monsters among them with 1500 or more ATK, .
A complete list of cards that have been modified in this way is: